Ensure invoking users password for privilege escalation when using sudo

An XCCDF Rule

Description

The sudoers security policy requires that users authenticate themselves before they can use sudo. When sudoers requires authentication, it validates the invoking user's credentials. The expected output for:

 sudo cvtsudoers -f sudoers /etc/sudoers | grep -E '^Defaults !?(rootpw|targetpw|runaspw)$'

 Defaults !targetpw
      Defaults !rootpw
      Defaults !runaspw

or if cvtsudoers not supported:

 sudo find /etc/sudoers /etc/sudoers.d \( \! -name '*~' -a \! -name '*.*' \) -exec grep -E --with-filename '^[[:blank:]]*Defaults[[:blank:]](.*[[:blank:]])?!?\b(rootpw|targetpw|runaspw)' -- {} \;

 /etc/sudoers:Defaults !targetpw
      /etc/sudoers:Defaults !rootpw
      /etc/sudoers:Defaults !runaspw

Rationale

If the rootpw, targetpw, or runaspw flags are defined and not disabled, by default the operating system will prompt the invoking user for the "root" user password.

ID: xccdf_org.ssgproject.content_rule_sudoers_validate_passwd
Severity: Medium
References: CCI-000366 CCI-002227

CM-6(b) CM-6.1(iv)

SRG-OS-000480-GPOS-00227

OL08-00-010383

SV-248584r880554_rule
Updated: about 1 year ago

# Remediation is applicable only in certain platforms
if rpm --quiet -q sudo; then

if grep -x '^Defaults targetpw$' /etc/sudoers; then
    sed -i "/Defaults targetpw/d" /etc/sudoers \;
fiif grep -x '^Defaults targetpw$' /etc/sudoers.d/*; then
    find /etc/sudoers.d/ -type f -exec sed -i "/Defaults targetpw/d" {} \;
fi
if grep -x '^Defaults rootpw$' /etc/sudoers; then
    sed -i "/Defaults rootpw/d" /etc/sudoers \;
fi
if grep -x '^Defaults rootpw$' /etc/sudoers.d/*; then
    find /etc/sudoers.d/ -type f -exec sed -i "/Defaults rootpw/d" {} \;
fi
if grep -x '^Defaults runaspw$' /etc/sudoers; then
    sed -i "/Defaults runaspw/d" /etc/sudoers \;
fi
if grep -x '^Defaults runaspw$' /etc/sudoers.d/*; then
    find /etc/sudoers.d/ -type f -exec sed -i "/Defaults runaspw/d" {} \;
fi

if [ -e "/etc/sudoers" ] ; then
    
    LC_ALL=C sed -i "/Defaults !targetpw/d" "/etc/sudoers"
else
    touch "/etc/sudoers"
fi
# make sure file has newline at the end
sed -i -e '$a\' "/etc/sudoers"

cp "/etc/sudoers" "/etc/sudoers.bak"
# Insert at the end of the file
printf '%s\n' "Defaults !targetpw" >> "/etc/sudoers"
# Clean up after ourselves.
rm "/etc/sudoers.bak"
if [ -e "/etc/sudoers" ] ; then
    
    LC_ALL=C sed -i "/Defaults !rootpw/d" "/etc/sudoers"
else
    touch "/etc/sudoers"
fi
# make sure file has newline at the end
sed -i -e '$a\' "/etc/sudoers"

cp "/etc/sudoers" "/etc/sudoers.bak"
# Insert at the end of the file
printf '%s\n' "Defaults !rootpw" >> "/etc/sudoers"
# Clean up after ourselves.
rm "/etc/sudoers.bak"
if [ -e "/etc/sudoers" ] ; then
    
    LC_ALL=C sed -i "/Defaults !runaspw/d" "/etc/sudoers"
else
    touch "/etc/sudoers"
fi
# make sure file has newline at the end
sed -i -e '$a\' "/etc/sudoers"

cp "/etc/sudoers" "/etc/sudoers.bak"
# Insert at the end of the file
printf '%s\n' "Defaults !runaspw" >> "/etc/sudoers"
# Clean up after ourselves.
rm "/etc/sudoers.bak"

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Find out if /etc/sudoers.d/* files contain Defaults targetpw to be deduplicated
  find:
    path: /etc/sudoers.d
    patterns: '*'
    contains: ^Defaults targetpw$
  register: sudoers_d_defaults
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Remove found occurrences of Defaults targetpw from /etc/sudoers.d/* files
  lineinfile:
    path: '{{ item.path }}'
    regexp: ^Defaults targetpw$
    state: absent
  with_items: '{{ sudoers_d_defaults.files }}'
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Find out if /etc/sudoers.d/* files contain Defaults rootpw to be deduplicated
  find:
    path: /etc/sudoers.d
    patterns: '*'
    contains: ^Defaults rootpw$
  register: sudoers_d_defaults
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Remove found occurrences of Defaults rootpw from /etc/sudoers.d/* files
  lineinfile:
    path: '{{ item.path }}'
    regexp: ^Defaults rootpw$
    state: absent
  with_items: '{{ sudoers_d_defaults.files }}'
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Find out if /etc/sudoers.d/* files contain Defaults runaspw to be deduplicated
  find:
    path: /etc/sudoers.d
    patterns: '*'
    contains: ^Defaults runaspw$
  register: sudoers_d_defaults
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Remove found occurrences of Defaults runaspw from /etc/sudoers.d/* files
  lineinfile:
    path: '{{ item.path }}'
    regexp: ^Defaults runaspw$
    state: absent
  with_items: '{{ sudoers_d_defaults.files }}'
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Remove any ocurrences of Defaults targetpw in /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    regexp: ^Defaults targetpw$
    validate: /usr/sbin/visudo -cf %s
    state: absent
  register: sudoers_file_defaults
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Remove any ocurrences of Defaults rootpw in /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    regexp: ^Defaults rootpw$
    validate: /usr/sbin/visudo -cf %s
    state: absent
  register: sudoers_file_defaults
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Remove any ocurrences of Defaults runaspw in /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    regexp: ^Defaults runaspw$
    validate: /usr/sbin/visudo -cf %s
    state: absent
  register: sudoers_file_defaults
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Check for duplicate values
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !targetpw$
    state: absent
  check_mode: true
  changed_when: false
  register: dupes
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Deduplicate values from /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !targetpw$
    state: absent
  when:
  - '"sudo" in ansible_facts.packages'
  - dupes.found is defined and dupes.found > 1
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Insert correct line into /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !targetpw$
    line: Defaults !targetpw
    state: present
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Check for duplicate values
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !rootpw$
    state: absent
  check_mode: true
  changed_when: false
  register: dupes
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Deduplicate values from /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !rootpw$
    state: absent
  when:
  - '"sudo" in ansible_facts.packages'
  - dupes.found is defined and dupes.found > 1
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Insert correct line into /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !rootpw$
    line: Defaults !rootpw
    state: present
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Check for duplicate values
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !runaspw$
    state: absent
  check_mode: true
  changed_when: false
  register: dupes
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Deduplicate values from /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !runaspw$
    state: absent
  when:
  - '"sudo" in ansible_facts.packages'
  - dupes.found is defined and dupes.found > 1
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

- name: Insert correct line into /etc/sudoers
  lineinfile:
    path: /etc/sudoers
    create: false
    regexp: ^Defaults !runaspw$
    line: Defaults !runaspw
    state: present
  when: '"sudo" in ansible_facts.packages'
  tags:
  - DISA-STIG-OL08-00-010383
  - NIST-800-53-CM-6(b)
  - NIST-800-53-CM-6.1(iv)
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy
  - sudoers_validate_passwd

Ensure invoking users password for privilege escalation when using sudo

Description

Rationale

Remediation - Shell Script

Remediation - Ansible